贵州红枫湖地区冷暖两季土壤/大气界面间汞交换通量的对比

Comparison of Air/Soil Mercury Exchange Between Warm and Cold Season in Hongfeng Reservoir Region

采用动力学通量箱 (DynamicFluxChamber ,DFC)与高时间分辨率自动大气测汞仪联用技术 ,于 2 0 0 2年 7月和 2 0 0 3年3月对红枫湖地区土壤 /大气界面上汞交换通量进行了测定 .夏冬 2季土壤 大气汞的交换通量分别为 (2 7 4± 4 0 1)ng·(m2 ·h) -1(n =2 5 5 )和 (5 6± 19 4 )ng·(m2 ·h) -1(n =192 ) .夏季汞交换通量和光照、气温及土壤温度的相关系数分别为 0 74、0 83和 0 80 ,而冬季分别为 0 88、0 5 6和 0 5 9.对比研究表明 :暖季土壤向大气的释汞通量远高于冷季 ;2个季节光照、温度等气象因素对土壤 /大气界面间汞交换均有重要的影响 .

In July 2002 and March 2003, the mercury exchange flux between soil and air was measured using dynamic flux chamber method in Hongfeng Reservoir region. Mercury exchange flux is (27.4±40.1) ng·(m2·h) -1 (n=255) and (5.6±19.4) ng·(m2·h) -1 (n=192) in summer and winter respectively. The correlation coefficient between mercury flux and solar radiation, air temperature, soil temperature is 0.74, 0.83 and 0.80 in summer, and 0.88, 0.56 and 0.59 in winter. From the data, it was found that the mercury emission is stronger in summer than that in winter, and compared to winter, mercury exchange between soil and air depends more on meteorological conditions in summer.